<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

</head>
<body>

<div id="app">
    <h1 v-if="ok">yes</h1>
    <h1 v-else>no</h1>
</div>
<div id="app2">
    <h1 v-if="type==='A'">A</h1>
    <h1 v-else-if="type==='B'">B</h1>
    <h1 v-else>error</h1>
</div>
<script src = "https://cdn.jsdelivr.net/npm/vue@2.5.21/dist/vue.min.js"></script>
<script>

    var vm = new Vue({
        el: "#app",
        data:{
            message: "hello,vue2!",
            ok: false
        }
    });
    var vm2 = new Vue({
        el: "#app2",
        data:{
            message: "hello,vue2!",
            ok: false,
            type: 'C'
        }
    });
</script>
</body>
</html>